LTC3706 Datasheet, PDF (8/20 Pages) Linear Technology – Secondary-Side Synchronous Forward Controller with PolyPhase Capability

LTC3706
BLOCK DIAGRAM
I_S+
2×
16
+
32×
I_S–
–
15
2V
+
C
–
I_TH
7
0.60V
FB
6
SLP
14
FS/SYNC
13
PHASE
5
MODE
4
+
C
–
+
EA
–
g_m = 2.8mS
RUN/SS
DRIVE/DMAX
CONTROL
0.25V
+
C
–
2.5V
SLOPE
COMP 1
BLANK
OSC
AND _DMAX
PLL
RUN/SS
8
FB
V_CCUV
4V_SB
SOFT-
START
SHDN
SSLOW
WAIT
UVLO
V_SOUT
9
V_S+
40k
10
V_S–
40k
11
OC
4V_SB
RESTRT1
OT
40k
+
V_SENSE
AMP
–
40k
V_CC
SHDN
UVLO
(4.25/4.5)
I_TRP
WAIT
OVP
SKIP
BLANK
RESET
DOMINANT
R
Q
S
DMAX
PWM
+
OC
C
3.2V –
OVERCURRENT
V_CC
WAIT
V_CC
OVP
ZERO
CROSSING
DETECT
V_CC
DRIVER
ENCODING
AND
V_CC
LOGIC
DRIVE
TYPE
FG
2
PGND
23
SG
1
0.2V
SW
20
PT⁺
22
PGND
PT^–
21
V_INUV
REG
4V_SB
4V_SB
RQ
S
OT LATCH
4V_SB
V_CCUV
V_REF
1.24V
60k
+
A
–
V_IN
4V V_CC
V_IN
+
A
–
5V_DC TO
30V_DC
V_IN
19
NDRV
18
SHDN
275k
g_m = 5μS
V_CC
24
5V_DC TO
10V_DC
REGSD
17
FB
OVP
PGOOD/OVP
0.6V
PGOOD
3
GND
12
3706 BD
••
PULSE
XFMR
3706fb
8